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To cover molecular biology through to medicine we need a large knowledge artefact to serve as background knowledge for SeaLife. This artefact must support sensible navigation between documents on the web.

There is a varying degree of semantics, expressivity and formality in these vocabularies (e.g. MeSH) and ontologies (e.g FMA). Most include some form of hierarchy. Hierarchies are well suited for driving navigation.

Question: Do we want strict sub/super class relationships? Or, do we want looser notations such as broader/narrower?